Rotary liquid ring pump with means for regulating the loading of liquid in the ring



y 1962 R. GABBIONETA 3 ROTARY LIQUID RING PUMP WITH MEANS FOR REGULATING THE LOADING OF LIQUID IN THE RING Filed Dec. 15, 1960 2 Sheets-Sheet 1 July 10, 1962 Filed Dec. 13, 1960 R. GABBIONETA ROTARY LIQUID RING PUMP WITH MEANS FOR REGULATING THE LOADING OF LIQUID IN THE RING 2 Sheets-Sheet 2 United States Patent 3,043,498 ROTARY LIQUID RING PUlVIP WITH MEANS FOR REGULATING THE THE RING Roberto Gabbioneta, Via Gasparotto 4, lVlilan, Italy Filed Dec. 13, 1960, Ser. No. 75,497

Claims priority, application Italy Dec. 29, 1959 '2 Claims. (Cl. 230-79) The present invention relates to rotary pumps of the liquid ring type designed for the regulating the loading of liquid in the ring.

It is well known that in pumps of this kind in use at present, part of the actual liquid comprising the ring escapes from the compression outlet.

This part of the liquid which has absorbed the heat of compression, has to be continually replaced by an equal quantity of cooled liquid.

When, as often happens in the chemical industry, the ring is composed of a special liquid, a closed circuit is established along which the same liquid circulates.

The liquid, which escapes from the compression outlet with the compressed gas, is separated in a device designed for this purpose and returns to the pump after having been passed through a heat exchanger which cools it to the required degree.

For every compression ratio there is a quantity of liquid in circulation which corresponds to an optimum gas intake loading. The most appropriate liquid loading depends on the characteristics of the machine and the working pressure, and increases with the working pressure.

The quantity of liquid has therefore to be appropriately controlled. This control is usually provided by means of a suitable cock inserted in the piping which carries the actual liquid.

Naturally when the machine is first started, it is necessary to make an accurate adjustment and there is always the danger that the setting of the cock be accidentally altered thus changing the efiectiveness of the machine.

It is one object of the present invention to provide a rotary liquid ring pump with means for regulating the loading of liquid in the ring, which eliminates this disadvantage and to obtain better working and greater efficiency of the pump.

It is another object of the present invention to provide a rotary liquid ring pump with means for regulating the loading of liquid in the ring, wherein the cooled liquid returning to the inside of the chamber in the body wherein the rotor revolves, reaches the chamber through a passage situated inside a frusto-conical distributor, from which passage the liquid passes into the actualchamber through one or more removable and replaceable nozzles.

The nozzles are fitted in such a position that the velocity of the liquid leaving the nozzles compounded with the peripheral velocity of the rotor at the point of entrance of the blades, provides a relative velocity in a radial direction with respect to the rotation of the rotor itself, that is to say in the direction in which the blades protrude from the rotor.

The liquid thus enters the chamber without offering resistance to the blades of the rotor and thereby increases the efficiency of the pump.

It is yet another object of the present invention to provide a rotary liquid ring pump with means for regulating the loading of liquid in the ring, wherein the flow of liquid, required to give the best operation of the compressor, is determined, for example, by a pair of adjustable and replaceable nozzles.

The optimum liquid loading is established at the time of construction and in accordance therewith nozzles of the right size are fitted and said nozzles can be changed LOADING OF LIQUID IN 3,043,498 Patented July 10, 1962 2 in case the operating characteristics of the pump should undergo substantial changes.

For a given speed of rotation, the nozzles ensure the correct circulation for the entire range of normal working of the machine.

In fact for every increase in the working pressure, an increase in the pressure at which the liquid reaches the section of the passage immediately preceding the nozzles is established and hence a greater pressure at the mouths of the nozzles themselves, whereby the loading of the liquid in circulation is increased.

With these and other objects in view, which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

FIGURE 1 is a section of the pump along the lines 1--1 of FIG. 2, and

FIG. 2 is a section along the lines 2-2 of FIG. 1.

Referring now to the drawing, the pump comprises a body 3 with an internalwall having two surfaces which are eccentric with respect to the axis of rotation of a rotor 4. The rotor 4 is keyed onto a driving shaft 7. A non-rotatable member 1, carrying the intake 8 and the outlet 9, has disposed therein a conical distributor 2. In the distributor 2 is disposed a passage 10 wherein the cooled liquid returning to join the revolving ring in the body 3 flows. From the channel 10 the liquid reaches the inside of the chamber in the body 3 through two nozzles 5 and 6.

The nozzles are removable and can be replaced in cases where the working characteristics of the pump have to be appreciably modified.

When the pump is working, part of the liquid of the revolving ring escapes with the compressed gas through the outlet 9.

The liquid, having been separated from the gas in the apparatus provided for this purpose, and having been cooled in the heat exchanger (not shown), returns to the pump through the channel 10 at a pressure which is little less than that of the compression of the gas at the mouth of the outlet 9, because the loss of pressure by the liquid in the course of its movement through the apparatus and piping, can be kept within very small limits. The conical distributor 2 forms at its inner end a hub chamber 10' which communicates with the nozzles 5 and 6.

From the channel 10 the liquid returns to the inside of the body 3 passing, as already mentioned, through the hub chamber 10" and the two nozzles 5 and 6.

The position of the nozzles (FIG. 2) is such that the liquid acquires a relative velocity in a radial direction with respect to the rotation of the rotor 4. As a consequence, the liquid enters the chamber inside the body 3 without being obstructed by the blades of the rotor 4.

While I have disclosed one embodiment of the present invention, it is to be understood that this embodiment has been given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim:

1. In a rotary liquid ring pump for the intake and compression of gas,

a hollow body having an internal wall including two surfaces disposed eccentrically with respect to the axis of rotation of said pump,

a driving shaft rotatably mounted in said hollow body,

a rotor keyed to said driving shaft and rotatably disposed in said body,

a conical distributor disposed coaxially with said driving shaft and partly within said rotor,

a non-rotatable member including an inlet and an outlet and surrounding said conical distributor,

said conical distributor defining at its inner end a cham- 3 4. her and an axially. disposed channel communicating 2. The rotary liquid ring pump, as set'forth in claim with said chamber, 1, which includes at least one nozzle removably disposed in said conical two nozzles mounted in said conical distributor with distributor between said chamber and said rotor and parallel axes and disposed in opposite directions. positioned such that the liquid fed through said 5 channel and ejected from said nozzle into said cham- References Cited n i116 l Of this Patent sber acquires a relative velocity in radial direction FOREIGN PATENTS with res act to the rotation of said rotor, in vorder to feed s aid liquid unobstructively through said rotor Italy Sept 1953 into said body. 10 

